There are various ways to do this, most being variations on a theme. Most of my annealing is with BPCR cases, involving low pressure black powder loads. Goals is neck tension uniformity and extending case life.
I turn in an electric drill with a K&M case holder. For a heat sink I use a series of sponges with holes in the center. Besides keeping excess heat from the head area, it provides a "handle" to remove the hot case from the drill. Takes a bit of dexterity and practice, but it works well for me.
Paul